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The Gas Dynamic Trap is a magnetic mirror machine being operated at the Budker Institute of Nuclear Physics in Akademgorodok, Russia.
Contents
Technical Specifications
Dimensions The plasma inside the machine fills a cylinder of space, 7 meters long and 28 centimeters in diameter. The magnetic field varies along this tube. In the center the field is low; reaching (at most) 0.35 Teslas. The field rises to as high as 15 Teslas at the ends. This change in the strength is needed to reflect the particles and get them internally trapped (see: the magnetic mirror effect).
Heating The plasma is heated using two methods, simultaneously. The first is neutral beam injection, where a hot (25 KeV), neutral beam of material is shot into the machine at a rate of 5 megawatts. The second is Electron Cyclotron Resonance Heating which is where electromagnetic waves are used to heat a plasma, analogous to microwaving it.
Performance As of 2016, the machine had achieved a plasma trapping beta of 0.6 for 5E-3 seconds (or 5 milliseconds). It had reached a electron temperature of 1 KeV using the method of Electron cyclotron resonance heating. It had reached an ion density of 1E20 Ions/Meter^3. The machine loses material out of the ends of the mirror but material is replenished at such a rate as to maintain a density inside the machine.
Diagnostics
During any given experiment, operators can choose from at least 15 fusion diagnostics to measure the machines' behavior:
- Thomson Scattering
- Motional Stark Effect
- CX Energy Analysis (2)
- Rutherford Ion Scattering
- Ion End Loss Analyzer
- Microwave Interferometer
- Dispersion Interferometer
- Diamagnetic Loops
- Langmuir Probes
- Pyro electric Detectors
- RF Probes
- Beam Dump Calorimeters
- NBI Sec. Electron Detectors
- Neutron Detectors
- Thermonuclear Proton Detectors